Best Ganondorf

Challenge
You know the deal. Find a flag in this file?

Solution

File has .jpg extension but is not a valid jpeg. We open in a hex editor and it looks like it could be a jpeg file, but the header is invalid

we change the first two bytes of the header to FFD8 and now we can view the image (which contains the flag)

abctf{tfw_kage_r3kt_nyway}